Block-signal system.



2 SHEETS-SHEET 1.

PATENTED SEPT. 1, i908. P.B.GOREY. BLOCK SIGNAL SYSTEM.

APPLICATION FILED NOV. 2, 1906.

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ZYI/ZNY'UH FRED E. 50551 ATTY turn conductors for the U m STATES PATENT onnroa.

FRED B. COREY, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

BLOCK-SIGNAL SYSTEM.

Specification of Letters Patent.

1 Patented Sept. 1, 19,08.

' Application filed November 2, 1906. Serial 130.341.,762.

To all whom it may concern:

Be it known that I, FRED B. COREY, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Im rovements in Block-Signal Systems, of whlch'the following is a specification.

Myinvention relates to block signal systems for electric railways,'and consists in an improvement in the system disclosed in an'a L.

plication filed August 6, 1906, by

awkins, Serial No. 329,347, assigned to the General Electric Company. In'that, a plication is disclosed a system in which oth the track-rails are continuous to serve as reower current, and alternating voltages of different frequencies are impressed at intervals on g the track which actuate relays, each arranged torespond to one frequency only. Two relays may be placed at a point between two: sources of different frequency, each rela responding to one of the frequencies'ang the two relays jointly controlling the signal for the track section between the sources.

My invention-consists in providing a single relay adapted to take the lace of'the. two relays above mentioned. secure thisresult by providing the relay, in addition to its track winding, with windings cod crating therewith and supplied independent y of the' track with currents of the same frequencies as are supplied to the track-rails adjacent to the relay.

My invention will best be understood by reference to the which Figure :1 shows diagrammatically a signal system provided with relays in accordance with my invention; Fig. 2 shows a side elevation of one of the relays; and Fig. 3 a plan view of the same.

In Fig. 1, A. re resents the track-rails, which are electrica y continuous throughout their length. B represents the third-rail, or

accompanying drawing, in

other supply-conductor, which is connected to one terminal of the generator C, which furnishes the ower-current for the road? The other terminal of the power-generator C may be connected to the track-rails A through a differential choke-coil c. D and D represent alternating-current generators of high frequency, the current delivered by the two enerators differing in frequenc 61,11 and represent line-wires connects to the genformer windings.

on the secondary member.

return for the currents of both frequencies. E and E represent transformers which have their primary windings connected to the line-wires and-"secondary windings connected to the track-rails, so as to impress alternating current voltages on the trackrails at intervals. Small resistances e (2 may be employed to prevent 'an excessive flow of ower-current through the, trans It will be noted that adjacent transformers have their primaries conerators; the line-wire (1 serving as a common nected to line-wires of difierent frequencies.

F F etc, represent relays, each of which has a'winding f connected to the track rails through a resistance f at a oint between two transformers. This winr ing f is in inductive relation to a short-circuited secondary member-f which actuates the relay contacts. Cooperating with the winding f are two other windings f and f which are connected through suitable phase-controlling devices, such as condensers. g, to the line-.

wires. The winding f 'is connected to the same line-wires as the transformer E andthe winding f 2 is connected to the same linewires as the transformer E Consequently, these'windings are supplied independently of the track with'currents of the same frequencies as the currents that are impressed upon the track by the transformers .E and E Consequently the current in the winding f cooperates with that portion of the current in t e winding f which is supplied from transformer E to produce a torque upon the secondary member f Similarly the current in the windingf cooperates with that portion from the transformer E to produce a torque The windings are so arranged that these torques assist each other and the relay is so designed and proportioned that the cooperating effect of both windings f and f is required in order to hold the secondary member in closed-circuit osition. Consequently, if arail breaks, ori one of the transformers is short-circuited by a train, the relay torque will be insufficient to hold the rela contact closed, and the signal H controlle by the relay will go to danger. Thus]; have showna train between the trans- .of the current in winding f which is supplied formers E and E short-circuiting the t'ransformer E so that therela F has dropped its armature and signal 2 is at danger. Owing 'to the high impedance offered by the rails to the high-frequency current, a train which is on the farther .side of a transformer from a relay has little effect on the relay, so

that the blocks may be made nearly as definite in length as though insulating joints were used.

A suitable construction of the relay is shown in Figs. 2 and 3. In these figures the shortcireuited conducting membe'rf is windings cooperate with the middle winding to produce a torque as long as the middle winding is traversed by currents corresponding in frequency to that of both outer windmgs.

What I claim as new, and desire to secure by Letters Patent of the United States, is,-

'1. In a' block-signal system, a signal-controllingrelay having one winding connected to the track-rails and a plurality of windings su plied with current from a plurality of di erent' circuits carrying currents of different' frequencies and cooperating with the track-winding to control the signal.

. 2. In a block-signal system, means for supplying to the track-rails simultaneously a plurality of currents differing in character,

and a signal-controlling relay having one winding connected to the track-rails and windings supplied independently of the track with currents corresponding incharacter to those supplied to the track and co- 0 eratingl with the'track winding to control 't e signa 3. In a block-signal system, means for supplying to the track-rails a plurality of alternating-currents of different frequencies,

and a signal controlling relay having one l the track.

4. In a block-signal system, a signal-controlling relay comprising a short-circuited conducting member, a winding connected to the track-rails and in inductive relation to said short-eircuited member, and a plurality of windings connected to different circuits and cooperating with the track-winding to produce a torqueon said member.

5. In a block-signal system, means for supplying to the track-rails a plurality of alternating-currents differing in character, and a signal-controlling relay comprising a short-circ'uited conducting member, a winding connected to the track-rails and in in ductive relation to said member, and windings supplied independently of the track with" currents corresponding in character to those supplied to the track and cooperating with the track winding to produce a torque on said member.

6. In a block-signal system, means for supplying to the track-rails a plurality of alternating-currents differing in frequency, and a signal-controlling relay comprising a short-circuited conducting member, a winding connected to. the track-rails and in inductive relation to said member, and windings supplied independently of the track with currents corresponding in frequency to those supplied to the track and cooperating with the track winding to produce a torque 'on said member. r

In witness whereof, I have hereunto set my hand this 1st day of November, 1906.

FRED B. COREY. 

